Abstract
Absolute cross sections for the K-shell photoionization of boron-like (B-like) O3 + ions were measured by employing the ion–photon merged-beam technique at the SOLEIL synchrotron-radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/ΔE ≈5000 (≈110 meV, full width half maximum) was achieved with photon energy from 540 up to 600 eV. Several theoretical approaches, including R-matrix, multi-configuration Dirac–Fock and screening constant by unit nuclear charge were used to identify and characterize the strong 1s → 2p and the weaker 1s → 3p resonances observed in the K-shell spectra of this ion. The trend of the integrated oscillator strength and autoionization width (natural line width) of the strong 1s → 2p resonances along the first few ions of the B-like sequence is discussed.
Highlights
Single and multiply ionisation stages of C, N, O, Ne and Fe have been observed in the ionized outflow in the planetary nebulae NGC 4051, measured with the satellite XMM-Newton [1] in the soft-x-ray region
In Seyfert galaxies based on photoionization models, O IV comes from higher ionization states and lower density regions and is an accurate indicator of the power of the active galactic nuclei (AGN) [6]
A chopper, placed at the exit of the photon beam line, allows to subtract from the photo-ions signal the background produced by collisional-ionization processes, charge stripping on the collimator slits or autoionizing decay of metastable excited states produced in the Electron Cyclotron Resonance Ion Source (ECRIS)
Summary
Single and multiply ionisation stages of C, N, O, Ne and Fe have been observed in the ionized outflow in the planetary nebulae NGC 4051, measured with the satellite XMM-Newton [1] in the soft-x-ray region. Low ionized stages of C, N and O have been used in the modelling of x-ray emission from OB super-giants [2]. Ionization stages of O and Fe are seen in the XMM-Newton spectra from the Seyfert galaxy NGC 3783, including UV imaging, x-ray and UV light curves, the 0.2 – 10 keV x-ray continuum, the iron K - emission line, and high-resolution spectroscopy in the modelling of the soft x-ray warm absorber [3]. In the present study we focus our attention on obtaining detailed spectra on the triply ionized oxygen ion O3+ (O IV) in the vicinity of its K - edge
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